Photographic ray-filter.



avv-sus BH caoaa on 1,104,119

W. F. FOLMERAI PHOTDGBAPHIU RLY FILTER. ,Annunci 211.311' nl. u, m4.

. Patented July 21, 1914 n Milli' .UNITED sTATEs PATENT orFroE.

- nenne WILLIAH F. FOLMEB, OF ROCHESTER, NEW YOBK, ASSIGNOB TO EASTMAN KODAK COMPANY, OF ROCHESTER, NEW YORK, A CORPORATION OF NEW YORK.

PHOTOGRAPHIC BAY-FILTER.

Specification of Letters Patent.

Patented July 21, 1914.

T0 all whom t may concern.'

Be it known that I, VILLIAM F. FoLMER, of Rochester, in the county of Monroe and State of New York, have invented certain new and useful Improvements in Photographic Ray-Filters; and I do hereby declare the following to be a full, clear, and exact description of the same, reference being had to the accompanying drawings, forming a part of this specification, and to the reference numerals marked thereon.

My present invention relates to photography and more particularly to photographic cameras, and it has for its object to provide a simple, cheap and convenient form of ray filter for attachment to the lens tube of the camera whereby the actinic effect of the light rays admitted to the camera lens may be modified for well known purposes.

Further objects of the invention are to provide a structure whereby filter screens of different intensities may be readily interchanged in the one device and the latter made capable of fitting lens tubes of different sizes.

To these and other ends the invention resides in certain improvements and combinations of parts all as will be hereinafter more fully described, the novel features being pointed out in the claims at the end of the specification.

In the drawings: Figure 1 is a side elevation of a ray filter constructed in accordance with and illustrating one embodiment of my invention, the same being shown in place on the lens tube of a camera; Fig. 2 is a rear elevation of the filter enlarged; Fig. 3 is a section on the line 3 3 of Fig. 2, and Fig. 4 is a detail perspective of the lining strip constituting the lens tube gripping portion of the attachment.

Similar reference numerals in the several figures indicate the same parts.

Referring more particularly to the drawings, 1 indicates a tubular metallic cap fully open at its inner end but flanged inwardly at its outer end as at 2 to provide a shoulder or seat surrounding the light opening 3. The screen or filter proper, 4, rests against this seat and is usually composed of a colored glass disk. Beyond the screen, the interior of the tube is filled with an annular lining member 5 composed preferably of a soft rubber strip of the form shown in Fig. 4. It is angular in cross section and comprises a flanged base 6 that bears against the face of the screen 4. The inner surface of the body portion of the strip is provided at intervals with ribs 7 that preferably parallel the axis of the tube and hence run transversely of the strip.

The screen 4 is held in lace against its seat only by the strip 5, wiiile the latter is retained in position Within the tube only by its own elasticity and the clinging'nature of its composition. To these ends, the strip is cut of slightly greater length than the inside circumference of the tube and then crowded into it to occupy an annular position with its end faces 8 abutting but unattached. The rubber is therefore placed under an expanding tension causing it to grip the walls of the cap and resist displacement until its ends are separated. It can, however, be Y quickly removed when its said ends are so separated.

In use, the device is simply pressed over the end of the'lens tube 9 of the camera as shown in Fig. 1, the lining strip engaging and gripping the periphery ofthe lens tube. The ribs 7 set up the actual points of contact and being very soft and yielding, they cling tenaciously and will also adapt themselves to lens tubes differing slightly in size; For greater differences in the sizes of lens tubes, thinner or thicker lining strips 5 may be employed. Thus, with only two or three sizes of caps or tubes 1 and a set of several lining strips for each, a wide range of lens tube sizes can be accommodated. As before stated, the screen 4 may be easily removed and another one substituted by removing and replacing the lining strip that secures it.

I claim as my invention:

1. A photographic ray lter comprising a cap carrying a filter screen and having an open inner end provided with a compressible lining adapted to engage over and grip the outer end of a lens tube.

2. A photographic ray filter comprising a cap carrying a filter screen at its outer end and having an open inner end provided with a compressible lining arranged to secure the filter screen in place and adapted to also enlgage over and grip the outer end of a lens tu e.

3. In a photographic ray filter, the combination with a tubular cap having a seat or shoulder at its outer end, of a filter screen disposed against said shoulder and a. compressible hning ring arranged within the inner open end of the cap to secure the lter screen 1n place and adapted to also engage over and grip the outer end of a lens tube.

4. In a photographic ray lter, the combination with a tubular cap having a seat at its outer end and a lter screen disposed against said seat, of a detachable, compressible soft rubber lining ring arranged Within the inner open end of the cap to secure the filter screen in place against its seat and also adapted to engage over and grip the end of a lens tube.

5. In a photographic ray filter, the combination with a tubular cap havinga seat at its outer end and a filter screen disposed against said seat, of a detachable compressible lining ring arranged within the inner.`

open end of the cap to secure the filter screen in place against its seat and also adapted to' engage over and gzip the end of a lens tube w said lining ring ing composed of a strip;v

0f soft rubber slightly greater in length?? 6. A photographic ray lter comprising a cap carrying a filter screen and having an open inside end provided with a compressible soft rubber lining ring adapted to engage over and grip the outer end of a lens tube, said ring belng provided with yielding ribs constituting the gripping surfaces contacting with the lens tube.

WILLIAM F. F OLMER.

Witnesses:

GEORGE T. ROCHE, H. J. Po'i'rnn.

Copies ot this pstent my be obtained for nve cents each, by addressing the Commissioner of Patents.

` Washington, D. 0. 

